<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title><%= title %></title>

    <link rel="stylesheet" href="/bootstrap/dist/css/bootstrap.min.css">
</head>

<body>

<div id="container" class="container">
    <% if (locals.success) { %>
    <div id="alt_sucess" class="alert alert-success">
        <%- success %>
    </div>
    <% } %>

    <% if (locals.error) { %>
    <div id="alt_warniXng" class="alert alert-warning">
        <%= error %>
    </div>
    <% } %>

    <form class="form-signin" role="form" method="post" enctype='multipart/form-data'>
        <h2 class="form-signin-heading">上传文件</h2>
        <input id="fulAvatar" name="fulAvatar" type="file" class="form-control" />
        <br/>
        <button id="btnSub" class="btn btn-lg btn-primary" type="submit">上 传</button>
    </form>

</div>
</body>
</html>

<script src="/jquery/dist/jquery.min.js" type="text/javascript"></script>
<script type="text/javascript">
    String.prototype.format = function (args) {
        var result = this;
        if (arguments.length > 0) {
            if (arguments.length == 1 && typeof (args) == "object") {
                for (var key in args) {
                    if (args[key] != undefined) {
                        var reg = new RegExp("({" + key + "})", "g");
                        result = result.replace(reg, args[key]);
                    }
                }
            }
            else {
                for (var i = 0; i < arguments.length; i++) {
                    if (arguments[i] != undefined) {
                        var reg = new RegExp("({)" + i + "(})", "g");
                        result = result.replace(reg, arguments[i]);
                    }
                }
            }
        }
        return result;
    }

    $(function(){
        $('#btnSub').on('click',function(){
            var fulAvatarVal = $('#fulAvatar').val(),
                    errorTip = '<div id="errorTip" class="alert alert-warning">{0}</div> ';

            $("#errorTip,#alt_warning").remove();

            if(fulAvatarVal.length == 0)
            {
                $("#container").prepend(errorTip.format('请选择要上传的文件'));
                return false;
            }

            var extName = fulAvatarVal.substring(fulAvatarVal.lastIndexOf('.'),fulAvatarVal.length).toLowerCase();

            if(extName != '.png' && extName != '.jpg'){
                $("#container").prepend(errorTip.format('只支持png和jpg格式图片'));
                return false;
            }

            return true;
        })
    });

</script>